#include<stdio.h>
int is_leap_year(int n)
{
        if (((n % 4 == 0) && (n % 100 != 0)) || (n % 400 == 0))
        {
           return 1;
        }
        else
        {
            return 0;
        }
}

int main()
{
    int year = 0;
    
    for ( year = 1000; year <= 2000; year++)
    {
        if (is_leap_year(year))
        {
            printf("%d ",year);
        }
    }
    
    return 0;
}